Finding the Fourth Proportional to 9,158.44, 12,638.82 and 5,434.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.44 : 12,638.82 = 5,434.60 : x
2. Step 2: Convert to fraction form
   9,158.44/12,638.82 = 5,434.60/x
3. Step 3: Cross multiply
   9,158.44x = 12,638.82 × 5,434.60
4. Step 4: Simplify right side
   9,158.44x = 68,686,931.17
5. Step 5: Solve for x
   x = 68,686,931.17/9,158.44
6. Step 6: Final answer
   x = 7,499.85